to set the record straight:
tomioka and sanemi both die at 25 because of the mark. its unknown if tanjiro passed as well. they all got married before 25 (kanao x tanjiro, idk about sanemi and tomioka) and had at least one child that went on to have more children. in chapter 205 of KNY, it shows descendants of sanemi and tomioka, which means they both got married to a woman and had a child before they died (which means, tomioka and sanemi were not gay).
its kinda stupid how I see people talking about how they couldn't have children because they die at 25 💀like bro sanemi and tomioka are 21, they had plenty of time to find wives and have children.